🔥 Pool Heater BTU Calculator Find the right BTU size. Gas, heat pump, electric. Includes running cost estimate. All pool shapesGas & heat pumpRunning cost Based on ASHRAE standards. Formula: Surface Area x Temp Rise x 12. 1 Pool 2 Temperature 3 Environment 1 Pool shape ✓ ▭ Rectangle ◯ Round / Circular ⬤ Oval … Continue reading Pool Heater Calculator (BTU)